US20070258739A1 - Cleaning device, fixing device, and image forming apparatus - Google Patents
Cleaning device, fixing device, and image forming apparatus Download PDFInfo
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- US20070258739A1 US20070258739A1 US11/679,200 US67920007A US2007258739A1 US 20070258739 A1 US20070258739 A1 US 20070258739A1 US 67920007 A US67920007 A US 67920007A US 2007258739 A1 US2007258739 A1 US 2007258739A1
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- Prior art keywords
- cleaning
- belt
- detector
- roller
- sheet
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
Definitions
- the present invention relates to a cleaning device for cleaning a surface of a body by intermittently feeding a cleaning belt in compressive contact with the surface.
- the invention also relates to a fixing device including a fixing roller as a body to be cleaned.
- the invention further relates to an image forming apparatus including such a fixing device.
- An image forming apparatus for electrophotographic image formation includes a fixing device with a pair of fixing rollers.
- One of the fixing rollers is a heating roller heated to a temperature at which toner can melt.
- the other fixing roller is a pressing roller in compressive contact with the heating roller.
- a recording medium such as paper having a toner image transferred to it is passing between the fixing rollers, the fixing device heats and presses the medium so as to fix the image on the medium.
- the fixing device is fitted with cleaning devices for removing the toner on the roller surfaces.
- a conventional cleaning device includes a cleaning belt called a web sheet, which may be made of woven cloth.
- the cleaning belt is wound on an unwinder and can be fed intermittently from it via a cleaning position, where the belt is brought into compressive contact with the cylindrical surface of a fixing roller.
- the fed belt is then wound up by a winder.
- the cleaning belt is impregnated with a cleaning agent such as silicon oil.
- Such a cleaning device can also be applied as a device for cleaning a dirty surface of a part of a device other than the fixing device of image forming apparatus.
- the unwinder may include a delivery roller, the cylindrical surface of which is wound with the cleaning belt. If the portion of the cleaning belt that remains on the delivery roller becomes shorter than the circumference of the roller, no sufficient tension can be applied to the belt, so that the belt cannot come into compressive contact with the fixing roller in the cleaning position. This results in insufficient cleaning. If the belt portion on the delivery roller becomes shorter than the roller circumference, a trailing end portion of the cleaning belt becomes loose. The loose belt portion may come into contact with other parts of the apparatus than the fixing roller, so that the parts may be dirtied with the cleaning agent with which the cleaning belt is impregnated, and/or their functions may lower.
- Another conventional cleaning device counts the rotations of the delivery roller of an unwinder or the wind-up roller of a winder. Based on the number of rotations of the roller, the cleaning device determines the length of the portion of a cleaning belt that is wound on the roller. Before a trailing end portion of the cleaning belt becomes unable to be held reliably on the unwinder, the user is prompted to replace the belt.
- the relation between the number of rotations of the delivery or wind-up roller and the length of the belt portion wound on the roller varies with the number of turns of the wound belt portion.
- the cleaning belt is flexible, the relation between the number of rotations and the length of the wound belt portion is not always equal even if the number of turns is equal.
- the wind-up roller is wound with a portion of the cleaning belt to which toner has stuck, it is impossible to accurately determine the relation between the number of rotations of this roller and the length of the belt portion wound on the roller.
- the object of the present invention is to provide a cleaning device, a fixing device, and an image forming apparatus each of which detects between the unwinder and the cleaning position an end point on the cleaning belt that is near to the trailing end of the belt in order to prompt the user to replace the belt at a proper time before the belt end becomes unable to be held reliably on the unwinder, so that the belt on the unwinder can be used without a too long or too short end portion of it remaining unused.
- the present invention comprises a cleaning belt, an unwinder, a winder, and a detector.
- the unwinder is wound with the cleaning belt.
- the winder winds up the cleaning belt intermittently from the unwinder along a path leading past a cleaning position where the belt is brought into contact with a body to be cleaned.
- the detector is fitted in a detecting position on the path between the unwinder and the cleaning position.
- the cleaning belt has an end point set on it near its trailing end and associated with the detecting position. When detecting the end point, the detector outputs a detection signal.
- FIG. 1 is a schematic sectional side view of an image forming apparatus according to a first embodiment of the present invention
- FIG. 2 is a sectional view of the fixing device of the image forming apparatus
- FIG. 3 is a plan view of a trailing end portion of a web sheet used for the cleaning device of the image forming apparatus
- FIG. 4 shows the structure of the cleaning device in detail
- FIG. 5 is a block diagram of the control unit of the image forming apparatus
- FIG. 6A is a plan view of a trailing end portion of a web sheet used for a cleaning device according to a second embodiment of the present invention.
- FIG. 6B is a plan view of a trailing end portion of a web sheet used for a cleaning device according to a third embodiment of the present invention.
- FIG. 1 is a schematic sectional side view of an image forming apparatus 100 according to a first embodiment of the present invention.
- the image forming apparatus 100 includes an image reading unit 200 , an image forming unit 300 , and a paper feeding unit 400 .
- the image reading unit 200 includes an ADF (automatic document feeder) 201 , a first document platform 202 , a second document platform 203 , a first mirror base 204 , a second mirror base 205 , a lens 206 , and a CCD (charge coupled device) 207 .
- the CCD 207 might be replaced by another image sensor.
- the ADF 201 feeds documents one after one from a document tray 211 via the second document platform 203 to a discharge tray 212 .
- the rear edge of the ADF 201 is supported pivotably in such a manner that the ADF can cover the top of the first document platform 202 .
- By raising the front edge of the ADF 201 so as to expose the first document platform 202 it is possible to place a document manually on this platform.
- the document platforms 202 and 203 are a hard glass plate.
- the mirror bases 204 and 205 are supported horizontally movably under the document platforms 202 and 203 .
- the speed at which the second mirror base 205 moves is 1 ⁇ 2 of the speed at which the first mirror base 204 moves.
- the first mirror base 204 carries a light source and a first mirror.
- the second mirror base 205 carries a second mirror and a third mirror.
- the image on a document being fed by the ADF 201 can be read with the first mirror base 204 stopping under the second document platform 203 .
- the light source on the first mirror base 204 under the second document platform 203 radiates light to the front side of the document passing over this platform.
- the light reflected by this side of the document is then reflected by the first mirror on the first mirror base 204 toward the second mirror base 205 .
- the image on a document placed on the first document platform 202 can be read with the mirror bases 204 and 205 moving horizontally under this platform.
- the light source on the first mirror base 204 moving under the first document platform 202 radiates light to the front side of the document on this platform.
- the light reflected by this side of the document is then reflected by the first mirror on the first mirror base 204 toward the second mirror base 205 .
- the light reflected by the front side of the document is incident on the CCD 207 via the second and third mirrors on the second mirror base 205 and the lens 206 , with the optical path length constant.
- the CCD 207 outputs an electric signal in proportion to the quantity of light reflected by the front side of the document.
- the electric signal is input as image data into the image forming unit 300 .
- the image forming unit 300 includes a photosensitive drum 31 , a charging device 32 , an exposure device 33 , a developing device 34 , a transfer belt 35 , a cleaner 36 , and a fixing device 37 , which form parts of an image former 30 .
- the photosensitive drum 31 has a photosensitive layer formed on its cylindrical surface and rotates clockwise in FIG. 1 .
- the charging device 32 charges the drum surface uniformly to a preset electric potential.
- the charging device 32 may be either a non-contact type charging device with a charger or a contact type charging device with a roller or a brush.
- the exposure device 33 irradiates the cylindrical surface of the photosensitive drum 31 with light based on image data. Photoconduction in the photosensitive layer of the drum 31 forms an electrostatic latent image on the irradiated surface of the drum 31 .
- the exposure device 33 scans the drum surface axially of the drum 31 with a laser beam modulated with image data. Alternatively, the exposure device 33 might be replaced by an exposure device having an array of ELs, LEDs, or other light emitting devices.
- the developing device 34 supplies the cylindrical surface of the photosensitive drum 31 with toner to make the electrostatic latent image visible.
- the transfer belt 35 forms a loop around rollers under the photosensitive drum 31 and has a resistance between about 1 ⁇ 10 9 and 1 ⁇ 10 13 ⁇ cm.
- a transfer roller 35 A is supported inside the transfer belt 35 and keeps it in compressive contact with the cylindrical surface of the photosensitive drum 31 .
- a transfer voltage is applied to the transfer roller 35 A.
- the toner image on the photosensitive drum 31 is transferred to a sheet of paper passing between the drum and the transfer belt 35 .
- the cleaner 36 removes the toner remaining on the portion of the drum surface from which the toner image has been transferred.
- the fixing device 37 includes a heating roller 37 A and a pressing roller 37 B.
- the heating roller 37 A has a heater fitted in it for heating it to a temperature at which the toner on this roller can melt.
- the pressing roller 37 B is biased for compressive contact with the heating roller 37 A at a preset pressure. While a sheet of paper having a toner image transferred to it is passing between the rollers 37 A and 37 B, the fixing device 37 heats and presses the sheet so as to fix the image fast on the sheet. After passing through the fixing device 37 , the sheet of paper is discharged to a delivery tray 38 , which is fitted on one side of the image forming apparatus 100 .
- the paper feeding unit 400 includes paper feeding cassettes 401 - 404 and a manual feed tray 405 .
- Each of the paper feeding cassettes 401 - 404 holds sheets of paper of a size.
- the manual feed tray 405 supports a sheet of paper of size or quality for less frequent use.
- the paper feeding unit 400 feeds sheets of paper one after one from one of the paper feeding cassettes 401 - 404 or the manual feed tray 405 .
- a sheet of paper fed from the paper feeding unit 400 is conveyed through a paper conveying passage 10 to the image former 30 .
- the paper conveying passage 10 includes a first conveying passage 11 , a second conveying passage 12 , a third conveying passage 13 , a fourth conveying passage 14 , and a fifth conveying passage 15 .
- FIG. 2 shows the structure of the fixing device 37 .
- the fixing device 37 includes a pair of fixing rollers, which are the heating roller 37 A and the pressing roller 37 B, heater lamps 371 , 372 , 374 , and 376 , an external heating roller 373 , a thermister 375 , a cleaning device 1 , and release nails 377 and 378 .
- a sheet of paper conveyed along conveying guides 11 A- 11 C through the first conveying passage 11 has a toner image transferred to its front side.
- the conveyed sheet passes with its front side up between the heating roller 37 A and the pressing roller 37 B.
- the heater lamps 371 and 372 are fitted in the heating roller 37 A.
- the heater lamp 374 is fitted in the external heating roller 373 .
- the cylindrical surfaces of the heating rollers 37 A and 373 are kept in compressive contact with each other.
- the heater lamps 371 and 372 and the external heating roller 373 heat the heating roller 37 A to a preset temperature of about 180-200 degrees C., at which the toner can melt.
- the thermister 375 senses the surface temperature of the heating roller 37 A.
- the heater lamp 376 is fitted in the pressing roller 37 B and heats it to a temperature of about 150 degrees C.
- the pressing roller 37 B is biased toward the heating roller 37 A so that the cylindrical surfaces of these rollers can come into compressive contact with each other.
- one of the release nails 377 and 378 releases the sheet from the cylindrical surface of the adjacent roller 37 A or 37 B if the sheet follows the surface.
- the sheet of paper While passing between the heating roller 37 A and the pressing roller 37 B, the sheet of paper is heated and pressed, so that the toner image transferred to it penetrates into it under pressure while melting with heat. After the sheet of paper passes between these rollers 37 A and 37 B, its temperature lowers, so that the toner image on the sheet hardens and is fixed fast on it.
- the cleaning device 1 includes a web sheet 2 as a cleaning belt, a delivery roller 3 , a wind-up roller 4 , a pressure roller 5 , tension rollers 6 and 7 , and a detector 20 .
- the web sheet 2 is a belt of woven or unwoven cloth.
- the delivery roller 3 and the wind-up roller 4 are supported in an unwinder and a winder respectively.
- the web sheet 2 moves along the sheet path leading from the unwinder past the tension roller 6 , the pressure roller 5 , and the tension roller 7 in order to the winder.
- the cylindrical surface of the delivery roller 3 is wound with a preset number of turns of the web sheet 2 , which has not been used.
- the wind-up roller 4 winds up a used portion of the web sheet 2 on its cylindrical surface.
- the pressure roller 5 presses the web sheet 2 against the cylindrical surface of the heating roller 37 A in a cleaning position P.
- the tension rollers 6 and 7 apply a preset tension to the web sheet 2 moving along the sheet path.
- the web sheet 2 is kept in compressive contact with the cylindrical surface of the heating roller 37 A over a nip width N at the cleaning position P. Every time a preset number of sheets of paper have passed between the heating roller 37 A and the pressing roller 37 B, the wind-up roller 4 turns by a preset angle, winding up a preset length of the web sheet 2 . While the web sheet 2 is sliding on the cylindrical surface of the heating roller 37 A, the sheet removes toner, paper dust, etc. from the surface.
- the delivery roller 3 While the wind-up roller 4 is rotating to wind up the web sheet 2 , the delivery roller 3 rotates.
- the portion of the web sheet 2 that is wound on the wind-up roller 4 is equal in length to the portion of this sheet that is unwound from the delivery roller 3 .
- the trailing end of the web sheet 2 is not fixed to the cylindrical surface of the delivery roller 3 .
- the trailing end of this sheet is held fixedly between the sheet and the cylindrical surface of this roller. This results in sufficient tension acting on the web sheet 2 over the sheet path, which leads from the delivery roller 3 past the cleaning position P to the wind-up roller 4 .
- the trailing end of this sheet is not held between the sheet and the cylindrical surface of this roller but can move freely. This results in no sufficient tension acting on the web sheet 2 . In addition, this may bring a trailing end portion of the web sheet 2 into contact with the heating roller 37 A and other parts in the fixing device 37 .
- the contact of the web sheet 2 may cause malfunction of the apparatus.
- the web sheet 2 is impregnated with silicon oil or another cleaning agent, which improves its cleaning function. The cleaning agent dirties the parts in contact with the web sheet 2 .
- FIG. 3 is a plan view of a trailing end portion of the web sheet 2 .
- the sheet end portion has an opening 8 as the detection part of the present invention.
- the opening 8 is formed in a zone extending longitudinally of the web sheet 2 and near one edge of it.
- the zone has a width W 1 in the lateral directions W across the web sheet 2 .
- the trailing edge of the opening 8 which is upstream in the wind-up direction S, is spaced a distance LS 1 from the trailing end of the web sheet 2 .
- FIG. 4 shows the structure of the cleaning device 1 in detail.
- the cleaning device 1 includes a detector 20 , which is fitted on the sheet path between the delivery roller 3 and the tension roller 6 .
- the detector 20 detects the opening 8 in the web sheet 2 and outputs a detection signal.
- the detector 20 includes a pair of terminals 21 and 22 , a presser 23 , a power source 24 , and a voltmeter 25 .
- the terminals 21 and 22 are connected to the power source 24 and the voltmeter 25 respectively and positioned on both sides of the web sheet 2 .
- the elasticity of the presser 23 biases the terminal 22 toward the terminal 21 to keep the two terminals in compressive contact with the web sheet 2 .
- the terminals 21 and 22 are positioned in the zone of width W 1 of the web sheet 2 .
- the presser 23 may be a coil spring, which biases the terminal 22 toward the terminal 21 .
- the power source 24 applies a preset voltage to the terminal 21 .
- the voltmeter 25 measures the voltage applied to the terminal 22 .
- the sheet insulates the terminals, so that the voltmeter 25 detects no voltage.
- the opening 8 is positioned between the terminals 21 and 22 , they are connected electrically, so that the voltmeter 25 detects the voltage applied to the terminal 22 .
- the voltmeter 25 detects a voltage equal to or higher than a reference value, it outputs a detection signal.
- the detector 20 detects the opening 8 by means of the voltmeter 25 .
- the detector 20 is positioned at a distance LW 2 from the position where the web sheet 2 leaves the cylindrical surface of the delivery roller 3 .
- the distance LS 1 ( FIG. 3 ) between the trailing end of the web sheet 2 and the trailing edge of the opening 8 is longer than the sum of the distance LW 2 and the circumferential length LR of the delivery roller 3 .
- the detector 20 detects the opening 8 , at least one turn of the web sheet 2 remains on the delivery roller 3 . Accordingly, with sufficient tension acting on the web sheet 2 , it is possible to detect that a short portion of the sheet remains on the delivery roller 3 .
- FIG. 5 shows the control unit 50 of the image forming apparatus 100 , which is the controller of the present invention.
- the control unit 50 includes a CPU 51 , a ROM 52 , a RAM 53 , and a display controller 54 .
- the detection signal from the voltmeter 25 is input via an interface 54 to the CPU 51 .
- the display controller 55 is connected to a display 56 , which is fitted on an outer surface of the image forming apparatus 100 .
- the CPU 51 can output the display data for a message prompting the user to replace the web sheet 2 .
- the CPU outputs the display data to the display controller 55 .
- the display controller 55 displays the prompting message on the display 56 .
- the prompting message might be replaced by the number of sheets on which images can be formed by the time the web sheet 2 is replaced.
- This number is the number of sheets that pass through the fixing device 37 by the time the cylindrical surface of the heating roller 37 A is in such a dirty limit condition that the surface can be cleaned by the unused portion of the web sheet 2 .
- This number may be a preset value or a value calculated from the average image concentration in the image formation performed by the image forming apparatus 100 .
- the opening 8 in the web sheet 2 is detected between the delivery roller 3 and the cleaning position P in the sheet path, the opening is prevented from reaching this position before the sheet is replaced. Accordingly, the cylindrical surface of the heating roller 37 A is cleaned reliably until the web sheet 2 is replaced.
- FIGS. 6A and 6B are plan views of trailing end portions of web sheets 2 A and 2 B used for cleaning devices according to a second embodiment and a third embodiment respectively of the present invention.
- the web sheet 2 A has openings 8 A- 8 D formed as detection parts in a zone extending in the wind-up direction S and having the width W 1 .
- the openings 8 A- 8 D are spaced in the wind-up direction S.
- the dimensions of the openings 8 A- 8 D in the wind-up direction S are larger toward the trailing end of the web sheet 2 A. Accordingly, the time taken by the detector 20 to detect each of the openings 8 A- 8 D is longer toward the trailing end of the web sheet 2 A.
- the CPU 51 can determine which of the openings 8 A- 8 D is being detected by the detector 20 . It depends on the length of the unused portion of the web sheet 2 A which of the openings 8 A- 8 D is being detected by the detector 20 .
- the CPU 51 displays different messages on the display 56 depending on which of the openings 8 A- 8 D is being detected by the detector 20 .
- the messages for the openings 8 A- 8 D can be stored in a memory area of the ROM 52 .
- the urgency in a message prompting the user to replace the web sheet 2 A is greater for the opening 8 D than for the opening 8 C, greater for the opening 8 C than for the opening 8 B, and greater for the opening 8 B than for the opening 8 A.
- the CPU 51 might display the number of sheets on which images can be formed by the time the web sheet 2 A is replaced. This number of sheets is smaller for the opening 8 D than for the opening 8 C, smaller for the opening 8 C than for the opening 8 B, and smaller for the opening 8 B than for the opening 8 A.
- the web sheet 2 B has openings 81 A- 81 E formed as detection parts in a zone extending in the wind-up direction S and having the width W 1 .
- the dimensions of the openings 81 A- 81 E in the wind-up direction S are equal.
- a memory area of the RAM 53 may be allotted for a counter, which the CPU 51 causes to count the number of times detection signals are input from the detector 20 to the CPU. According to the count from the counter, the CPU 51 displays the different degrees of urgency in the messages prompting the user to replace the web sheet 2 B. Alternatively, according to the count, the CPU 51 might display different numbers of sheets on which images can be formed by the time the web sheet 2 B is replaced.
- the openings 81 A- 81 E in the web sheet 2 B are spaced at intervals shorter toward the trailing end of the sheet. This makes it possible to gradually shorten the intervals at which the display on the display 56 changes.
- the web sheet 2 A has four openings 8 A- 8 D arrayed in the wind-up direction S.
- one of the first three openings 8 A- 8 C may reach the cleaning position P. If any of the openings 8 A- 8 C stopped in the cleaning position P, the cylindrical surface of the heating roller 37 A would be cleaned insufficiently.
- each of the first three openings 8 A- 8 C by the detector 20 enables the CPU 51 to recognize the position of the opening in the sheet path, that is, the distance between the current position of the opening and the cleaning position P. Because the turns of the web sheet 2 A on the wind-up roller 4 are equal in length, the CPU 51 can calculate from the number of turns of the sheet on this roller the distance each of the openings 8 A- 8 C has moved.
- the distance LS 2 between the trailing end of the web sheet 2 A and the first opening 8 A is shorter than the sum of the circumferential length LR of the delivery roller 3 and the distance LW 1 .
- the distance LW 1 is the length of the portion of the sheet path that extends between the cleaning position P and the position where the web sheet 2 A leaves the cylindrical surface of the delivery roller 3 .
- the first opening 8 A does not reach the cleaning position P before the detector 20 detects the last opening 8 D between the cleaning position and the position where the web sheet 2 A leaves the cylindrical surface of the delivery roller 3 .
- the web sheet 2 wound on the delivery roller 3 is impregnated with silicon oil or another cleaning agent, which may affect the detection of the opening 8 by the detector 20 . Therefore, a web sheet 2 impregnated with no cleaning agent might alternatively be wound on the delivery roller 3 and supplied with a cleaning agent between the detector 20 and the cleaning position P.
- the tension roller 6 might supply the cleaning agent, so that the apparatus could avoid being large in size. This applies to the web sheets 2 A and 2 B as well.
- the detector 20 would not be limited to what detects the electric connection between the terminals 21 and 22 .
- the detector 20 might be replaced by a contact type sensor on condition that it would not damage the surfaces of the web sheet 2 .
- the detector 20 might be replaced by a non-contact sensor such as an optical sensor.
- the detection part is not limited to the opening 8 . If the detector 20 were an optical sensor, a sheet different in light reflectance or transmittance from the material for the web sheet 2 might be stuck as a detection part on the web sheet. This applies to the web sheets 2 A and 2 B as well.
- a cleaning device identical with the cleaning device 1 may be provided for the pressing roller 37 B.
- a cleaning device according to the present invention can be used with not only the fixing device of an image forming apparatus but also another device having a part that should be cleaned with a cleaning belt.
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Abstract
Description
- This Nonprovisional application claims priority under 35 U.S.C.§ 119(a) on Patent Application No. 2006-058903 filed in Japan on Mar. 6, 2006, the entire contents of which are hereby incorporated by reference.
- The present invention relates to a cleaning device for cleaning a surface of a body by intermittently feeding a cleaning belt in compressive contact with the surface. The invention also relates to a fixing device including a fixing roller as a body to be cleaned. The invention further relates to an image forming apparatus including such a fixing device.
- An image forming apparatus for electrophotographic image formation includes a fixing device with a pair of fixing rollers. One of the fixing rollers is a heating roller heated to a temperature at which toner can melt. The other fixing roller is a pressing roller in compressive contact with the heating roller. While a recording medium such as paper having a toner image transferred to it is passing between the fixing rollers, the fixing device heats and presses the medium so as to fix the image on the medium.
- While the recording medium is passing between the fixing rollers, part of the toner transferred to the medium sticks to the cylindrical surfaces of the rollers. The toner on the roller surfaces would dirty or spoil the following recording media passing between the fixing rollers. Therefore, the fixing device is fitted with cleaning devices for removing the toner on the roller surfaces.
- In recent years, it has been demanded that image forming apparatus perform image formation at higher speed and accordingly feed recording media at higher speed. When recording media pass at higher speed between the fixing rollers of an image forming apparatus, larger amounts of toner stick to the cylindrical surfaces of the rollers. The cleaning devices fitted to the fixing device of the apparatus need to remove large amounts of toner on the roller surfaces reliably over a long time.
- As disclosed in JP-2003-107952A, a conventional cleaning device includes a cleaning belt called a web sheet, which may be made of woven cloth. The cleaning belt is wound on an unwinder and can be fed intermittently from it via a cleaning position, where the belt is brought into compressive contact with the cylindrical surface of a fixing roller. The fed belt is then wound up by a winder. The cleaning belt is impregnated with a cleaning agent such as silicon oil.
- Such a cleaning device can also be applied as a device for cleaning a dirty surface of a part of a device other than the fixing device of image forming apparatus.
- As the cleaning belt is wound up repeatedly, its portion remaining on the unwinder decreases, so that a trailing end portion of it becomes unable to be held reliably by the unwinder. The unwinder may include a delivery roller, the cylindrical surface of which is wound with the cleaning belt. If the portion of the cleaning belt that remains on the delivery roller becomes shorter than the circumference of the roller, no sufficient tension can be applied to the belt, so that the belt cannot come into compressive contact with the fixing roller in the cleaning position. This results in insufficient cleaning. If the belt portion on the delivery roller becomes shorter than the roller circumference, a trailing end portion of the cleaning belt becomes loose. The loose belt portion may come into contact with other parts of the apparatus than the fixing roller, so that the parts may be dirtied with the cleaning agent with which the cleaning belt is impregnated, and/or their functions may lower.
- Another conventional cleaning device counts the rotations of the delivery roller of an unwinder or the wind-up roller of a winder. Based on the number of rotations of the roller, the cleaning device determines the length of the portion of a cleaning belt that is wound on the roller. Before a trailing end portion of the cleaning belt becomes unable to be held reliably on the unwinder, the user is prompted to replace the belt.
- However, the relation between the number of rotations of the delivery or wind-up roller and the length of the belt portion wound on the roller varies with the number of turns of the wound belt portion. Besides, because the cleaning belt is flexible, the relation between the number of rotations and the length of the wound belt portion is not always equal even if the number of turns is equal. In particular, because the wind-up roller is wound with a portion of the cleaning belt to which toner has stuck, it is impossible to accurately determine the relation between the number of rotations of this roller and the length of the belt portion wound on the roller.
- Accordingly, it is impossible to accurately detect the length of the wound portion of the cleaning belt of a conventional cleaning device. This prevents the user from being prompted to replace the cleaning belt at the proper time. If the belt replacement is delayed, the body to be cleaned cannot be cleaned sufficiently, and the cleaning agent may dirty other bodies and lower their functions. If the belt replacement is too early, the cleaning belt is thrown away with a long portion of it remaining unused. This results in a high running cost.
- The object of the present invention is to provide a cleaning device, a fixing device, and an image forming apparatus each of which detects between the unwinder and the cleaning position an end point on the cleaning belt that is near to the trailing end of the belt in order to prompt the user to replace the belt at a proper time before the belt end becomes unable to be held reliably on the unwinder, so that the belt on the unwinder can be used without a too long or too short end portion of it remaining unused.
- The present invention comprises a cleaning belt, an unwinder, a winder, and a detector. The unwinder is wound with the cleaning belt. The winder winds up the cleaning belt intermittently from the unwinder along a path leading past a cleaning position where the belt is brought into contact with a body to be cleaned. The detector is fitted in a detecting position on the path between the unwinder and the cleaning position. The cleaning belt has an end point set on it near its trailing end and associated with the detecting position. When detecting the end point, the detector outputs a detection signal.
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FIG. 1 is a schematic sectional side view of an image forming apparatus according to a first embodiment of the present invention; -
FIG. 2 is a sectional view of the fixing device of the image forming apparatus; -
FIG. 3 is a plan view of a trailing end portion of a web sheet used for the cleaning device of the image forming apparatus; -
FIG. 4 shows the structure of the cleaning device in detail; -
FIG. 5 is a block diagram of the control unit of the image forming apparatus; -
FIG. 6A is a plan view of a trailing end portion of a web sheet used for a cleaning device according to a second embodiment of the present invention; and -
FIG. 6B is a plan view of a trailing end portion of a web sheet used for a cleaning device according to a third embodiment of the present invention. - Preferred embodiments of the present invention will be described below in detail with reference to the drawings.
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FIG. 1 is a schematic sectional side view of animage forming apparatus 100 according to a first embodiment of the present invention. Theimage forming apparatus 100 includes animage reading unit 200, animage forming unit 300, and apaper feeding unit 400. - The
image reading unit 200 includes an ADF (automatic document feeder) 201, afirst document platform 202, a second document platform 203, afirst mirror base 204, a second mirror base 205, alens 206, and a CCD (charge coupled device) 207. TheCCD 207 might be replaced by another image sensor. - The ADF 201 feeds documents one after one from a
document tray 211 via the second document platform 203 to adischarge tray 212. The rear edge of the ADF 201 is supported pivotably in such a manner that the ADF can cover the top of thefirst document platform 202. By raising the front edge of the ADF 201 so as to expose thefirst document platform 202, it is possible to place a document manually on this platform. - The
document platforms 202 and 203 are a hard glass plate. - The mirror bases 204 and 205 are supported horizontally movably under the
document platforms 202 and 203. The speed at which the second mirror base 205 moves is ½ of the speed at which thefirst mirror base 204 moves. Thefirst mirror base 204 carries a light source and a first mirror. The second mirror base 205 carries a second mirror and a third mirror. - The image on a document being fed by the
ADF 201 can be read with thefirst mirror base 204 stopping under the second document platform 203. The light source on thefirst mirror base 204 under the second document platform 203 radiates light to the front side of the document passing over this platform. The light reflected by this side of the document is then reflected by the first mirror on thefirst mirror base 204 toward the second mirror base 205. - The image on a document placed on the
first document platform 202 can be read with the mirror bases 204 and 205 moving horizontally under this platform. The light source on thefirst mirror base 204 moving under thefirst document platform 202 radiates light to the front side of the document on this platform. The light reflected by this side of the document is then reflected by the first mirror on thefirst mirror base 204 toward the second mirror base 205. - Whether the
ADF 201 is used or not, the light reflected by the front side of the document is incident on theCCD 207 via the second and third mirrors on the second mirror base 205 and thelens 206, with the optical path length constant. - The
CCD 207 outputs an electric signal in proportion to the quantity of light reflected by the front side of the document. The electric signal is input as image data into theimage forming unit 300. - The
image forming unit 300 includes aphotosensitive drum 31, a chargingdevice 32, anexposure device 33, a developingdevice 34, atransfer belt 35, a cleaner 36, and a fixingdevice 37, which form parts of an image former 30. - The
photosensitive drum 31 has a photosensitive layer formed on its cylindrical surface and rotates clockwise inFIG. 1 . The chargingdevice 32 charges the drum surface uniformly to a preset electric potential. The chargingdevice 32 may be either a non-contact type charging device with a charger or a contact type charging device with a roller or a brush. - The
exposure device 33 irradiates the cylindrical surface of thephotosensitive drum 31 with light based on image data. Photoconduction in the photosensitive layer of thedrum 31 forms an electrostatic latent image on the irradiated surface of thedrum 31. Theexposure device 33 scans the drum surface axially of thedrum 31 with a laser beam modulated with image data. Alternatively, theexposure device 33 might be replaced by an exposure device having an array of ELs, LEDs, or other light emitting devices. - The developing
device 34 supplies the cylindrical surface of thephotosensitive drum 31 with toner to make the electrostatic latent image visible. - The
transfer belt 35 forms a loop around rollers under thephotosensitive drum 31 and has a resistance between about 1×109 and 1×1013 Ω·cm. Atransfer roller 35A is supported inside thetransfer belt 35 and keeps it in compressive contact with the cylindrical surface of thephotosensitive drum 31. A transfer voltage is applied to thetransfer roller 35A. The toner image on thephotosensitive drum 31 is transferred to a sheet of paper passing between the drum and thetransfer belt 35. - The cleaner 36 removes the toner remaining on the portion of the drum surface from which the toner image has been transferred.
- The fixing
device 37 includes aheating roller 37A and apressing roller 37B. Theheating roller 37A has a heater fitted in it for heating it to a temperature at which the toner on this roller can melt. Thepressing roller 37B is biased for compressive contact with theheating roller 37A at a preset pressure. While a sheet of paper having a toner image transferred to it is passing between therollers device 37 heats and presses the sheet so as to fix the image fast on the sheet. After passing through the fixingdevice 37, the sheet of paper is discharged to adelivery tray 38, which is fitted on one side of theimage forming apparatus 100. - The
paper feeding unit 400 includes paper feeding cassettes 401-404 and amanual feed tray 405. Each of the paper feeding cassettes 401-404 holds sheets of paper of a size. Themanual feed tray 405 supports a sheet of paper of size or quality for less frequent use. - The
paper feeding unit 400 feeds sheets of paper one after one from one of the paper feeding cassettes 401-404 or themanual feed tray 405. A sheet of paper fed from thepaper feeding unit 400 is conveyed through apaper conveying passage 10 to the image former 30. Thepaper conveying passage 10 includes a first conveyingpassage 11, a second conveyingpassage 12, a third conveyingpassage 13, a fourth conveyingpassage 14, and a fifth conveyingpassage 15. -
FIG. 2 shows the structure of the fixingdevice 37. The fixingdevice 37 includes a pair of fixing rollers, which are theheating roller 37A and thepressing roller 37B,heater lamps external heating roller 373, athermister 375, acleaning device 1, and releasenails - A sheet of paper conveyed along conveying
guides 11A-11C through the first conveyingpassage 11 has a toner image transferred to its front side. The conveyed sheet passes with its front side up between theheating roller 37A and thepressing roller 37B. - The
heater lamps heating roller 37A. Theheater lamp 374 is fitted in theexternal heating roller 373. The cylindrical surfaces of theheating rollers heater lamps external heating roller 373 heat theheating roller 37A to a preset temperature of about 180-200 degrees C., at which the toner can melt. Thethermister 375 senses the surface temperature of theheating roller 37A. - The
heater lamp 376 is fitted in thepressing roller 37B and heats it to a temperature of about 150 degrees C. Thepressing roller 37B is biased toward theheating roller 37A so that the cylindrical surfaces of these rollers can come into compressive contact with each other. - After the sheet of paper passes between the
heating roller 37A and thepressing roller 37B, one of the release nails 377 and 378 releases the sheet from the cylindrical surface of theadjacent roller - While passing between the
heating roller 37A and thepressing roller 37B, the sheet of paper is heated and pressed, so that the toner image transferred to it penetrates into it under pressure while melting with heat. After the sheet of paper passes between theserollers - While the sheet of paper is passing between the
heating roller 37A and thepressing roller 37B, part of the toner that has not been fixed, paper dust, etc. on the sheet stick to the cylindrical surface of theheating roller 37A. - The
cleaning device 1 includes aweb sheet 2 as a cleaning belt, adelivery roller 3, a wind-uproller 4, apressure roller 5,tension rollers detector 20. Theweb sheet 2 is a belt of woven or unwoven cloth. Thedelivery roller 3 and the wind-uproller 4 are supported in an unwinder and a winder respectively. Theweb sheet 2 moves along the sheet path leading from the unwinder past thetension roller 6, thepressure roller 5, and thetension roller 7 in order to the winder. - The cylindrical surface of the
delivery roller 3 is wound with a preset number of turns of theweb sheet 2, which has not been used. The wind-uproller 4 winds up a used portion of theweb sheet 2 on its cylindrical surface. Thepressure roller 5 presses theweb sheet 2 against the cylindrical surface of theheating roller 37A in a cleaning position P. Thetension rollers web sheet 2 moving along the sheet path. - The
web sheet 2 is kept in compressive contact with the cylindrical surface of theheating roller 37A over a nip width N at the cleaning position P. Every time a preset number of sheets of paper have passed between theheating roller 37A and thepressing roller 37B, the wind-uproller 4 turns by a preset angle, winding up a preset length of theweb sheet 2. While theweb sheet 2 is sliding on the cylindrical surface of theheating roller 37A, the sheet removes toner, paper dust, etc. from the surface. - While the wind-up
roller 4 is rotating to wind up theweb sheet 2, thedelivery roller 3 rotates. The portion of theweb sheet 2 that is wound on the wind-uproller 4 is equal in length to the portion of this sheet that is unwound from thedelivery roller 3. - The trailing end of the
web sheet 2 is not fixed to the cylindrical surface of thedelivery roller 3. When the number of turns of theweb sheet 2 on thedelivery roller 3 is more than one, the trailing end of this sheet is held fixedly between the sheet and the cylindrical surface of this roller. This results in sufficient tension acting on theweb sheet 2 over the sheet path, which leads from thedelivery roller 3 past the cleaning position P to the wind-uproller 4. - When the number of turns of the
web sheet 2 on thedelivery roller 3 is less than one, the trailing end of this sheet is not held between the sheet and the cylindrical surface of this roller but can move freely. This results in no sufficient tension acting on theweb sheet 2. In addition, this may bring a trailing end portion of theweb sheet 2 into contact with theheating roller 37A and other parts in the fixingdevice 37. The contact of theweb sheet 2 may cause malfunction of the apparatus. Theweb sheet 2 is impregnated with silicon oil or another cleaning agent, which improves its cleaning function. The cleaning agent dirties the parts in contact with theweb sheet 2. - Therefore, it is necessary to detect whether the number of turns of the
web sheet 2 on thedelivery roller 3 is small or not when the number is more than one. If the number is small, theweb sheet 2 needs to be replaced. -
FIG. 3 is a plan view of a trailing end portion of theweb sheet 2. The sheet end portion has an opening 8 as the detection part of the present invention. The opening 8 is formed in a zone extending longitudinally of theweb sheet 2 and near one edge of it. The zone has a width W1 in the lateral directions W across theweb sheet 2. The trailing edge of the opening 8, which is upstream in the wind-up direction S, is spaced a distance LS1 from the trailing end of theweb sheet 2. -
FIG. 4 shows the structure of thecleaning device 1 in detail. As stated already, thecleaning device 1 includes adetector 20, which is fitted on the sheet path between thedelivery roller 3 and thetension roller 6. Thedetector 20 detects the opening 8 in theweb sheet 2 and outputs a detection signal. - The
detector 20 includes a pair ofterminals presser 23, apower source 24, and avoltmeter 25. Theterminals power source 24 and thevoltmeter 25 respectively and positioned on both sides of theweb sheet 2. The elasticity of thepresser 23 biases the terminal 22 toward the terminal 21 to keep the two terminals in compressive contact with theweb sheet 2. Theterminals web sheet 2. - The
presser 23 may be a coil spring, which biases the terminal 22 toward the terminal 21. Thepower source 24 applies a preset voltage to the terminal 21. Thevoltmeter 25 measures the voltage applied to the terminal 22. - When the opening 8 in the
web sheet 2 is not positioned between theterminals voltmeter 25 detects no voltage. When the opening 8 is positioned between theterminals voltmeter 25 detects the voltage applied to the terminal 22. When thevoltmeter 25 detects a voltage equal to or higher than a reference value, it outputs a detection signal. Thus, thedetector 20 detects the opening 8 by means of thevoltmeter 25. - The
detector 20 is positioned at a distance LW2 from the position where theweb sheet 2 leaves the cylindrical surface of thedelivery roller 3. The distance LS1 (FIG. 3 ) between the trailing end of theweb sheet 2 and the trailing edge of the opening 8 is longer than the sum of the distance LW2 and the circumferential length LR of thedelivery roller 3. - When the
detector 20 detects the opening 8, at least one turn of theweb sheet 2 remains on thedelivery roller 3. Accordingly, with sufficient tension acting on theweb sheet 2, it is possible to detect that a short portion of the sheet remains on thedelivery roller 3. -
FIG. 5 shows thecontrol unit 50 of theimage forming apparatus 100, which is the controller of the present invention. Thecontrol unit 50 includes aCPU 51, a ROM 52, aRAM 53, and adisplay controller 54. The detection signal from thevoltmeter 25 is input via aninterface 54 to theCPU 51. Thedisplay controller 55 is connected to adisplay 56, which is fitted on an outer surface of theimage forming apparatus 100. - In accordance with the program written in the ROM 52, the
CPU 51 can output the display data for a message prompting the user to replace theweb sheet 2. When a detection signal is input to theCPU 51, the CPU outputs the display data to thedisplay controller 55. Based on the display data, thedisplay controller 55 displays the prompting message on thedisplay 56. - The prompting message might be replaced by the number of sheets on which images can be formed by the time the
web sheet 2 is replaced. This number is the number of sheets that pass through the fixingdevice 37 by the time the cylindrical surface of theheating roller 37A is in such a dirty limit condition that the surface can be cleaned by the unused portion of theweb sheet 2. This number may be a preset value or a value calculated from the average image concentration in the image formation performed by theimage forming apparatus 100. - Thus, while sufficient tension is acting on the
web sheet 2, with at least one turn of the sheet remaining on thedelivery roller 3, it is possible to prompt the user to replace the sheet. Before theweb sheet 2 is replaced, a trailing end portion of it does not move freely. This keeps the apparatus from being dirtied and prevents its malfunction. - Because the opening 8 in the
web sheet 2 is detected between thedelivery roller 3 and the cleaning position P in the sheet path, the opening is prevented from reaching this position before the sheet is replaced. Accordingly, the cylindrical surface of theheating roller 37A is cleaned reliably until theweb sheet 2 is replaced. -
FIGS. 6A and 6B are plan views of trailing end portions ofweb sheets - With reference to
FIG. 6A , theweb sheet 2A hasopenings 8A-8D formed as detection parts in a zone extending in the wind-up direction S and having the width W1. Theopenings 8A-8D are spaced in the wind-up direction S. The dimensions of theopenings 8A-8D in the wind-up direction S are larger toward the trailing end of theweb sheet 2A. Accordingly, the time taken by thedetector 20 to detect each of theopenings 8A-8D is longer toward the trailing end of theweb sheet 2A. - From the differences between the times during which detection signals are input from the
voltmeter 25 to theCPU 51, the CPU can determine which of theopenings 8A-8D is being detected by thedetector 20. It depends on the length of the unused portion of theweb sheet 2A which of theopenings 8A-8D is being detected by thedetector 20. TheCPU 51 displays different messages on thedisplay 56 depending on which of theopenings 8A-8D is being detected by thedetector 20. The messages for theopenings 8A-8D can be stored in a memory area of the ROM 52. - The urgency in a message prompting the user to replace the
web sheet 2A is greater for theopening 8D than for theopening 8C, greater for theopening 8C than for theopening 8B, and greater for theopening 8B than for theopening 8A. Alternatively, theCPU 51 might display the number of sheets on which images can be formed by the time theweb sheet 2A is replaced. This number of sheets is smaller for theopening 8D than for theopening 8C, smaller for theopening 8C than for theopening 8B, and smaller for theopening 8B than for theopening 8A. - With reference to
FIG. 6B , theweb sheet 2B hasopenings 81A-81E formed as detection parts in a zone extending in the wind-up direction S and having the width W1. The dimensions of theopenings 81A-81E in the wind-up direction S are equal. A memory area of theRAM 53 may be allotted for a counter, which theCPU 51 causes to count the number of times detection signals are input from thedetector 20 to the CPU. According to the count from the counter, theCPU 51 displays the different degrees of urgency in the messages prompting the user to replace theweb sheet 2B. Alternatively, according to the count, theCPU 51 might display different numbers of sheets on which images can be formed by the time theweb sheet 2B is replaced. - The
openings 81A-81E in theweb sheet 2B are spaced at intervals shorter toward the trailing end of the sheet. This makes it possible to gradually shorten the intervals at which the display on thedisplay 56 changes. - As shown in
FIG. 6A and stated already, theweb sheet 2A has fouropenings 8A-8D arrayed in the wind-up direction S. When one of the last threeopenings 8B-8D is detected by thedetector 20, one of the first threeopenings 8A-8C may reach the cleaning position P. If any of theopenings 8A-8C stopped in the cleaning position P, the cylindrical surface of theheating roller 37A would be cleaned insufficiently. - The detection of each of the first three
openings 8A-8C by thedetector 20 enables theCPU 51 to recognize the position of the opening in the sheet path, that is, the distance between the current position of the opening and the cleaning position P. Because the turns of theweb sheet 2A on the wind-uproller 4 are equal in length, theCPU 51 can calculate from the number of turns of the sheet on this roller the distance each of theopenings 8A-8C has moved. With reference toFIG. 4 , if each of theopenings 8A-8C moves a distance ranging between LW1 minus LW2 (LW1−LW2) and LW1 minus LW2 plus N (LW1−LW2+N) after detected by thedetector 20 while the wind-uproller 4 is winding up theweb sheet 2A, this roller is kept rotating until it further winds up the sheet by a length equal to or longer than N. This prevents theopenings 8A-8C from stopping in the cleaning position P. - The distance LS2 between the trailing end of the
web sheet 2A and thefirst opening 8A is shorter than the sum of the circumferential length LR of thedelivery roller 3 and the distance LW1. The distance LW1 is the length of the portion of the sheet path that extends between the cleaning position P and the position where theweb sheet 2A leaves the cylindrical surface of thedelivery roller 3. Thefirst opening 8A does not reach the cleaning position P before thedetector 20 detects thelast opening 8D between the cleaning position and the position where theweb sheet 2A leaves the cylindrical surface of thedelivery roller 3. - As stated already, the
web sheet 2 wound on thedelivery roller 3 is impregnated with silicon oil or another cleaning agent, which may affect the detection of the opening 8 by thedetector 20. Therefore, aweb sheet 2 impregnated with no cleaning agent might alternatively be wound on thedelivery roller 3 and supplied with a cleaning agent between thedetector 20 and the cleaning position P. For example, thetension roller 6 might supply the cleaning agent, so that the apparatus could avoid being large in size. This applies to theweb sheets - The
detector 20 would not be limited to what detects the electric connection between theterminals detector 20 might be replaced by a contact type sensor on condition that it would not damage the surfaces of theweb sheet 2. Alternatively, thedetector 20 might be replaced by a non-contact sensor such as an optical sensor. - The detection part is not limited to the opening 8. If the
detector 20 were an optical sensor, a sheet different in light reflectance or transmittance from the material for theweb sheet 2 might be stuck as a detection part on the web sheet. This applies to theweb sheets - Another cleaning device identical with the
cleaning device 1 may be provided for thepressing roller 37B. A cleaning device according to the present invention can be used with not only the fixing device of an image forming apparatus but also another device having a part that should be cleaned with a cleaning belt. - It should be considered that the foregoing descriptions of the embodiments are illustrative in all respects and not restrictive. The scope of the present invention is defined by the appended claims, not by the embodiments, and intended to include meanings equivalent to those of the elements of the claims and all modifications in the claims.
Claims (11)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2006-058903 | 2006-03-06 | ||
JP2006-58903 | 2006-03-06 | ||
JP2006058903A JP4425870B2 (en) | 2006-03-06 | 2006-03-06 | Cleaning device, fixing device, and image forming apparatus |
Publications (2)
Publication Number | Publication Date |
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US20070258739A1 true US20070258739A1 (en) | 2007-11-08 |
US7715773B2 US7715773B2 (en) | 2010-05-11 |
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Application Number | Title | Priority Date | Filing Date |
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US11/679,200 Expired - Fee Related US7715773B2 (en) | 2006-03-06 | 2007-02-27 | Cleaning device, fixing device, and image forming apparatus |
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US (1) | US7715773B2 (en) |
JP (1) | JP4425870B2 (en) |
CN (1) | CN100529995C (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US20090148203A1 (en) * | 2007-12-11 | 2009-06-11 | Tadasu Taniguchi | Fusing device and image forming apparatus using the same |
US20100080633A1 (en) * | 2008-09-30 | 2010-04-01 | Xerox Corporation | Xerographic fusing system |
US20120114355A1 (en) * | 2010-11-10 | 2012-05-10 | Sharp Kabushiki Kaisha | Image forming apparatus |
CN105769041A (en) * | 2015-12-15 | 2016-07-20 | 深圳市宝乐机器人技术有限公司 | Edge detection method for glass rubbing device |
US10649391B2 (en) | 2018-09-04 | 2020-05-12 | Canon Kabushiki Kaisha | Image forming apparatus |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8180268B2 (en) * | 2008-05-14 | 2012-05-15 | Xerox Corporation | Method and apparatus for automatic fuser web material advancement in an image production unit |
JP4988880B2 (en) * | 2010-02-04 | 2012-08-01 | シャープ株式会社 | Fixing device, image forming apparatus using the fixing device, and fixing device control method |
JP7434764B2 (en) * | 2019-09-11 | 2024-02-21 | 京セラドキュメントソリューションズ株式会社 | Cleaning device and image forming device |
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US5168314A (en) * | 1989-04-20 | 1992-12-01 | Konica Corporation | Cleaning apparatus for heat fixing device wherein the amount of cleaning web is controlled based on the number of recorded sheets |
US5559591A (en) * | 1992-06-26 | 1996-09-24 | Canon Kabushiki Kaisha | Image forming apparatus with function of requesting exchange of fixing unit |
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US20090148203A1 (en) * | 2007-12-11 | 2009-06-11 | Tadasu Taniguchi | Fusing device and image forming apparatus using the same |
US8055172B2 (en) * | 2007-12-11 | 2011-11-08 | Sharp Kabushiki Kaisha | Fusing device with a web end detector and image forming apparatus incorporating same |
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US20120114355A1 (en) * | 2010-11-10 | 2012-05-10 | Sharp Kabushiki Kaisha | Image forming apparatus |
US8634732B2 (en) * | 2010-11-10 | 2014-01-21 | Sharp Kabushiki Kaisha | Image forming apparatus incorporating therein a fixing unit capable of cleaning a fixing roller by means of an oil roller and a cleaning roller |
CN105769041A (en) * | 2015-12-15 | 2016-07-20 | 深圳市宝乐机器人技术有限公司 | Edge detection method for glass rubbing device |
US10649391B2 (en) | 2018-09-04 | 2020-05-12 | Canon Kabushiki Kaisha | Image forming apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP4425870B2 (en) | 2010-03-03 |
CN101034274A (en) | 2007-09-12 |
JP2007240569A (en) | 2007-09-20 |
CN100529995C (en) | 2009-08-19 |
US7715773B2 (en) | 2010-05-11 |
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